Investigation for effects of hydrogen water on lipid and glucose metabolism in diabetes mellitus

INTERVENTION: Group A: Drinking of hydrogen water 0.6 L/day for 3 months, following 2 months washout and drinking of control water 0.6 L/day for 3 months Group B: Drinking of control water 0.6 L/day for 3 months, following 2 months washout and drinking of hydrogen water 0.6 L/day for 3 months CONDITION: Type 2 diabetes mellitus PRIMARY OUTCOME: lipid and glucose metabolism, oxidative stress and inflammation SECONDARY OUTCOME: 1) Fasting plasma glucose, insulin, HbA1c; 2) Body weight, waist circumference, body mass index INCLUSION CRITERIA: Patients with type 2 diabetes